Concrete beam form

Abstract

A lightweight, take-down beam form, including a series of U-frames held together by spaced apart adjustable longitudinal braces secured along the frame uprights and bottom longitudinal braces, support strippable plywood or plastic or suitable material beam forming sheets. The U-frames are bolted together for easy and quick assembly and easy disassembly when in place on a cured concrete beam, permitting easy release of the forming sheets from completed and cured concrete beams. For normal use, the form strips from a set beam as a modular unit. For some purposes, such as for spandrels, one or both sides could be released for the removal of the form.

I claim: 
     
       1. A light weight form for concrete beams comprising: (a) a plurality of yokes each in the shape of a general U-shaped metal member, having upright legs and at least one horizontal member and said yokes spacedly arranged along the length of the form;   (b) an upper, adjustable metal arm extending generally horizontally inwardly on each leg of each yoke, arranged for adjustment inwardly and outwardly;   (c) a lower, adjustable metal arm extending generally horizontally inwardly on each leg of each yoke below the associated upper arm, and each lower arm arranged for adjustment inwardly and outwardly;   (d) a longitudinal stringer mounted on the inner ends of the upper arms providing opposed longitudinal braces;   (e) a longitudinal stringer mounted on the inner ends of the lower arms providing opposed longitudinal braces;   (f) at least two continuous, longitudinal braces resting and mounted on the horizontal members of said yokes; and   (g) a continuous beam forming sheet mounted in said yokes in upright position on each side with each sheet fastened to the respective stringers and a continuous generally horizontal beam forming sheet secured to the horizontal longitudinal braces with said side sheets forming a tight joint with said generally horizontal sheet.   
     
     
       2. A light weight form for concrete beams according to claim 1 wherein holes are formed in the upright legs and the horizontal member for joining the same in a U-shape, said holes are arranged in at least pairs in spaced vertical alignment with the inside hole being near the inner edge of the legs permitting the leg to pivot downwardly on a bolt through the hole. 
     
     
       3. A light weight form for concrete beams according to claim 1 wherein said adjustable arms are bolted to the yoke legs with an elongated slit in the arms providing inward and outward adjustment. 
     
     
       4. A light weight form for concrete beams according to claim 1 wherein said adjustable arms are indepentantly adjustable to hold the beam forming sheets in vertical and angled from vertical position providing beams with a predetermined draft or with no draft. 
     
     
       5. A light weight form for concrete beams according to claim 1 wherein said yokes are formed of hollow, square metal upright legs, a pair of angles secured to opposite sides of said legs form said at least one horizontal member, and said upper and lower adjustable arms are metal angles.